Casper Weather Forecast

    • 47
    • 60

    Rain Showers

    • 42
    • 72

    Mostly Sunny

    • 47
    • 77

    Partly Sunny

    • 49
    • 80

    Mostly Sunny

    • 46
    • 80

    Mostly Sunny

    • 44
    • 74

    Mostly Sunny

    • 47
    • 80

    Mostly Sunny

Today 17 Sep Natrona County Lower Elevations

Cloudy with scattered Showers with isolated Thunderstorms. Near steady temperature in the upper 50s. North Winds around 10 Mph with Gusts up to 20 Mph. Chance of rain 30 percent.

Tonight 17 Sep Natrona County Lower Elevations

Mostly cloudy in the Evening, then becoming partly cloudy. Lows in the mid 40s. North Winds around 10 Mph with Gusts up to 20 Mph in the evening.

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Casper Temperature Statistics

September Temperature

Casper, Natrona County International Airport (8.1 miles)

  • Lowest 6 September, 2025

    37.9 °F

  • Average September

    65.5 °F

  • Highest 10 September, 2025

    90 °F

Climate (2020–Present)

Casper, Natrona County International Airport (8.1 miles)

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  • Average Low 2020–2025

    32.6 °F

  • Average 2020–2025

    46.7 °F

  • Average High 2020–2025

    60.3 °F
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